diameter - The length of the line through the center that touches two points on the edge of the circle., semi-circle - An arc which is half of the circumference., tangent line - A line coplanar with the circle and intersects at one and only one point. , arc - The part of the circumference between two points or a continuous piece of a circle., radius - A straight line drawn from the center of circumference., major arc - an arc whose measure is greater than half of the circle or greater than 180°, secant line - A line passing through two points of a circle., central angle - The angle that forms when two radii meet at the center of a circle., chord - A straight line joining two points on the circumference points of a circle., minor arc - An arc which measures less than half of the circle or less than 180°, circumference - The distance around or the perimeter of the circle., inscribed angle - An angle that is subtended at a point on a circle by two identified points on a circle.,

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